Hello
there could be many ways to publish your own book with a small cost.
About the editing, you can edit the book yourself or hire a graphic designer that will do for you.

About publishing, I can suggest platforms like amazon or blurb that have their own publishing platforms that allow you to publish and sell on the biggest book platforms and even bookstrore around the world, but your book has to have certain criterias based on the platform you want to use.
The copyright is yours untill you decide to sell it to someone.

I’m a copyeditor if you’re still looking for one. Your best bet, whether you contact me or not, is to find a freelance writer/editor. They will have the best availability and will have a fast turnaround time. If you look for in-house editing—that is, you try to pitch a book to a publisher first—you may very well never find someone to edit your work. Remember, the author of Harry Potter was turned down by a dozen publishers before someone finally accepted her book(s). However, just using Craigslist to find an editor can be sketchy. It’s best to use someone with a professional background or public presence. For example, I use Clarity and Writers Work as places I send potential clients so they can get a feel for my work and also be assured that I am who and what I claim to be rather than an anonymous email address on Craigslist. If you’d like to talk more with me, feel free to reach out. I’d be willing to do a free consult to discuss your options.